[FFmpeg-trac] #3836(avformat:new): No way to get real metadata field names

[FFmpeg]

#3836: No way to get real metadata field names
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             Reporter:  MoSal     |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 ff_metadata_conv() is always run unconditionally. Even if we are not
 remuxing/transcoding from one format to another (e.g. If we are only
 invoking ffprobe).

 I'm attaching a proof-of-concept patch that adds a decoding fflag
 'nometaconv'. It doesn't change current default behavior or break
 conversion if remuxing/transcoding from one format to another.

 I don't know if this is the right approach.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3836>
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